patch 9.1.0749: filetype: http files not recognized

Problem:  filetype: http files not recognized
Solution: detect '*.http' as http filetype, include
          http filetype plugin (Riley Bruins)

Based on the specification found
[here](https://github.com/JetBrains/http-request-in-editor-spec/blob/master/spec.md)

closes: #15762

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/MAINTAINERS

@@ -178,6 +178,7 @@ runtime/ftplugin/hgcommit.vim		@k-takata
 runtime/ftplugin/hlsplaylist.vim		@avidseeker
 runtime/ftplugin/hog.vim		@wtfbbqhax
 runtime/ftplugin/html.vim		@dkearns
+runtime/ftplugin/http.vim		@ribru17
 runtime/ftplugin/hyprlang.vim		@ribru17
 runtime/ftplugin/i3config.vim		@hiqua
 runtime/ftplugin/icon.vim		@dkearns

runtime/filetype.vim

@@ -1065,6 +1065,9 @@ au BufNewFile,BufRead init.trans,*/etc/translate-shell,.trans	setf clojure
 au BufNewFile,BufRead *.html,*.htm,*.shtml,*.stm  call dist#ft#FThtml()
 au BufNewFile,BufRead *.cshtml			setf html
 
+" HTTP request files
+au BufNewFile,BufRead *.http			setf http
+
 " HTML with Ruby - eRuby
 au BufNewFile,BufRead *.erb,*.rhtml		setf eruby
 

runtime/ftplugin/http.vim

@@ -0,0 +1,13 @@
+" Vim filetype plugin
+" Language:	HTTP
+" Maintainer:	Riley Bruins <ribru17@gmail.com>
+" Last Change:	2024 Sep 28
+
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+setl comments=:# commentstring=#\ %s
+
+let b:undo_ftplugin = 'setl com< cms<'

src/testdir/test_filetype.vim

@@ -340,6 +340,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     hostsaccess: ['/etc/hosts.allow', '/etc/hosts.deny', 'any/etc/hosts.allow', 'any/etc/hosts.deny'],
     # file.component.html should be HTML, not Angular, see #13594
     html: ['file.html', 'file.htm', 'file.cshtml', 'file.component.html'],
+    http: ['file.http'],
     htmlm4: ['file.html.m4'],
     httest: ['file.htt', 'file.htb'],
     hurl: ['file.hurl'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    749,
 /**/
     748,
 /**/